chore(deps): update determinatesystems/nix-installer-action action to v21

[dc-tec]

This PR contains the following updates:

Package	Type	Update	Change
DeterminateSystems/nix-installer-action	action	major	v20 -> v21

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Release Notes

DeterminateSystems/nix-installer-action (DeterminateSystems/nix-installer-action)

v21

Compare Source

What's Changed

• Update to determinate by default by @​grahamc in #​208

• If determinate is false, pass --prefer-upstream by @​grahamc in #​202

• Drop x86_64-darwin by @​grahamc in #​207

• Update detsys-ts: Merge pull request #​109 from DeterminateSystems/tsup-to-tsdown by @​detsys-pr-bot in #​203

• Update detsys-ts: Merge pull request #​114 from DeterminateSystems/dependabot/npm_and_yarn/npm-deps-47c548f420 by @​detsys-pr-bot in #​206

Full Changelog: https://github.com/DeterminateSystems/nix-installer-action/compare/v20...v21

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